Since 2003, Tradition Green has been arranging carbon transactions for companies with targets under the European Union's Emissions Trading System ETS, the world's biggest scheme for trading greenhouse gas emissions allowances.

The EU ETS is one of several tools developed by the EU Commission to assist in meetings EU carbon reduction targets. It covers some 11,000 power stations and industrial plants in 30 EU countries, the carbon emissions from which make up almost 50% of Europe's total. Currently in Phase III (2013–20),  the ETS is planned to continue until 2028 .